It depends on your constitution. If your stomach is not good, put the milk in warm water to protect it, otherwise it will have diarrhea if you drink it cold. On the other hand, if you are prone to constipation, you can drink something cold. But it's best not to take it out of the refrigerator at low temperature. It is generally recommended that you soak in warm water to 70-80 degrees. That's the best way to protect the stomach. In addition, drinking milk in the morning is best to eat something dry, such as biscuits, bread, steamed bread, tofu and so on.